 Collagen-based hydrogels have become increasingly popular in the field of skin repair due to their unique structure and properties. This paper reviews the current research and applications of these materials in skin repair over the past few years. It begins by discussing the structure and properties of collagen, followed by the preparation, structural properties, and application of collagen-based hydrogels in skin injury repair. Additionally, the influence of different collagen types, preparation methods, and cross-linking methods on the structural properties of hydrogels is explored. Finally, the future and potential of collagen-based hydrogels is discussed, providing insight into how they can be used in skin repair in the future. This article was authored by Yuan Zheng, Yang Wang, Ying Li, and others.